Unless it was overheard making grandiose and eloquent speeches about the fall of mankind, it's unlikely, lol
One thing that stands out to me about the picture is the top of the window in question. If you look at the other two top floor windows, you can see the clear straight line between white blind and the darker blue relected sky. The blind on the 'ghost' window looks very different, as though it curves drastically. It also looks like a slightly different shade of white. The close-up crops out this effect so you can't see it in the sharper detail.
If you look at these pictures:
You can cleary see that the window in question has some kind of loosely flowing curtains as well as the blind. My suspicions are that these curtains have something to do with the ghostly effect.
But I'm not ruling out photoshop on the close-up, something about the centre of the 'ghost', round the head area, looks decidedly off.